package com.hnjmxy.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class IDFilter
 */
@WebFilter("/admin/*")
public class IDFilter implements Filter {

    /**
     * Default constructor. 
     */
    public IDFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		//判断用户是否登录，通过session
		HttpServletRequest req = (HttpServletRequest)request;
		HttpServletResponse rep = (HttpServletResponse)response;
		HttpSession session = req.getSession();
		String id = (String)session.getAttribute("id");
		if(id==null) {
			//跳转到登录界面
			rep.sendRedirect("login.jsp");
		}else {
			chain.doFilter(request, response);
		}
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
